Dick Van Dyke as Jack Albany

Edward G. Robinson as Leo Joseph Smooth

Dorothy Provine as Sally Inwood

Henry Silva as Frank Boley

Tony Bill as Florian

Slim Pickens as Cowboy Schaeffer

Jack Elam as Ace Williams

Ned Glass as Rinzy Tobreski

Richard Bakalyan as Bobby Macoon

Mickey Shaughnessy as Francis

Philip Coolidge as Fingers Felton

James Millhollin as Museum Director

Joanna Moore as Melanie Smooth

Leon Alton as Exhibit Guest (uncredited)

Anthony Caruso as Tony Preston (uncredited)

John Cliff as Museum Guard (uncredited)

Russ Conway as Police Capt. Jacoby (uncredited)

John Dennis as Second Museum Guard (uncredited)

Ken Lynch as Police Lieutenant (uncredited)

Jerry Paris as Police Photographer (uncredited)

Clark Ross as Exhibit Guest (uncredited)

Jackie Russell as Sexy woman (uncredited)

Cosmo Sardo as Exhibit Guest (uncredited)

Johnny Silver as Prop Man (uncredited)